Fluidized bed heat exchange apparatus for recovering heat of flue gas for producing high temperature water

Patent metadata

Field	Value
Publication number	US-9360232-B2
Application number	US-201313733968-A
Country	US
Kind code	B2
Filing date	Jan 4, 2013
Priority date	Aug 23, 2012
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A fluidized bed heat exchange apparatus of a flue gas heat recovery type for producing high temperature water. The fluidized bed heat exchange apparatus passes a waste heat of a combustion flue gas containing a high temperature water vapor emitted from a combustion apparatus subsequently through a water fluidized bed and a heat medium fluidized bed such that a hot water at a saturation temperature of a wet air produced from a latent heat of the combustion flue gas at the water fluidized bed is again heated at the heat medium fluidized bed which does not have a vapor condensation phenomenon, thereby producing a hot water at a temperature higher than the saturation temperature of the wet air.

First claim

What is claimed is:

1. A fluidized bed heat exchanger for recovering a heat of a combustion flue gas to produce a hot water, comprising:
a compound fluidized bed heat exchanger including
a lower perforated plate having a plurality of holes therein and disposed in a lower side of the compound fluidized bed heat exchanger,
a first space formed between the lower perforated plate and a bottom surface of the compound fluidized bed heat exchanger,
a heat medium fluidized bed formed on the lower perforated plate and including a heat medium,
an upper perforated plate having a plurality of holes therein and disposed over the heat medium fluidized bed,
a second space formed between the upper perforated plate and the heat medium fluidized bed,
a water fluidized bed formed on the upper perforated plate and including a first water,
a flue gas inlet disposed in the lower side of the compound fluidized bed heat exchanger such that the combustion flue gas is introduced into the first space through the flue gas inlet,
a flue gas outlet disposed in a top of the compound fluidized bed heat exchanger and discharging the combustion flue gas passed through the heat medium fluidized bed and the water fluidized bed,
a third space formed between the water fluidized bed and the flue gas outlet,
an upper heat transfer tube installed inside the water fluidized bed, and
a lower heat transfer tube installed inside the heat medium fluidized bed;

a supply water pipe formed outside of the compound fluidized bed heat exchanger and connected to the upper heat transfer tube;
a hot water outlet pipe formed outside of the compound fluidized bed heat exchanger and connected to the lower heat transfer tube, wherein a supply second water flows through the supply water pipe, the upper heat transfer tube, the lower heat transfer tube and the hot water outlet pipe;
a fluidized medium tank disposed spaced from the compound fluidized bed heat exchanger and supplying and recovering the heat medium and the first water, respectively, to/from the heat medium fluidized bed and the water fluidized bed of the compound fluidized bed heat exchanger, the fluidized medium tank including
a water storage unit formed at a lower portion of the fluidized medium tank and storing the first water,
a heat medium storage unit formed at an upper portion of the fluidized medium tank and storing the heat medium, and
a fluidized medium connecting unit having a diameter smaller than diameters of the water storage unit and the heat medium storage unit and formed between the water storage unit and the heat medium storage unit;

a first water supply pipe supplying the first water from the water storage unit of the fluidized medium tank to the water fluidized bed and connected between a first water outlet disposed in a lower side of the water storage unit and a first water inlet disposed in an upper side of the compound fluidized bed heat exchanger, the first water inlet being disposed such that the first water is supplied to the third space;
a first water recovery pipe recovering the first water overflowing the water fluidized bed to the water storage unit of the fluidized medium tank and connected between a first water recovery hole disposed in an upper side of the water storage unit and a first water exit hole disposed in the upper side of the compound fluidized bed heat exchanger, the first water exit hole being disposed below the first water inlet;
a heat medium inlet pipe supplying the heat medium from the heat medium storage unit of the fluidized medium tank to the heat medium fluidized bed and connected between a heat medium outlet disposed in a middle side of the heat medium storage unit and a heat medium inlet disposed in a middle side of the compound fluidized bed heat exchanger, the heat medium inlet being disposed such that the heat medium is supplied to the second space; and
a heat medium recovery pipe recovering the heat medium overflowing the heat medium fluidized bed to the heat medium storage unit of the fluidized medium tank and connected between a heat medium recovery hole disposed in a lower side of the heat medium storage unit and a heat medium exit hole disposed in the middle side of the compound fluidized bed heat exchanger, the heat medium exit hole being disposed below the heat medium inlet.

2. The fluidized bed heat exchanger of claim 1 , further comprising:
an upper demister removing a droplet of the first water and installed between the flue gas outlet and the water fluidized bed; and
a lower demister removing a droplet of the heat medium and installed in the second space.

3. The fluidized bed heat exchanger of claim 1 , wherein the heat medium is an absorbent including a heat medium oil or LiBr.

4. The fluidized bed heat exchanger of claim 1 , wherein the compound fluidized bed heat exchanger has a rectangular prism shape, and the flue gas outlet has a relatively small diameter.

5. The fluidized bed heat exchanger of claim 1 , wherein the heat medium recovery hole is formed below the heat medium outlet such that the heat medium discharged through the heat medium outlet is supplied to the heat medium fluidized bed through heat medium inlet pipe and the overflown heat medium of the heat medium fluidized bed is recovered to the heat medium recovery hole through the heat medium recovery pipe.

6. The fluidized bed heat exchanger of claim 1 , wherein the first water recovery hole is formed above the first water medium outlet such that the first water discharged through the first water outlet is supplied to the water fluidized bed through the first water supply pipe and the overflown water of the water fluidized bed is recovered to the first water recovery hole through the first water recovery pipe.

Assignees

• Korea Energy Research Inst

Inventors

• Park Sang-Il
• Choi Kyoung-Bin
• Ko Chang-Bok

Classifications

• F28D21/0003

  the heat being recuperated from exhaust gases (F28D21/0014 takes precedence) · CPC title

• F24D2200/18

  Flue gas recuperation · CPC title

• F24H1/205 Primary

  with furnace tubes · CPC title

• F23J15/06 Primary

  of coolers · CPC title

• F28D13/00

  Heat-exchange apparatus using a fluidised bed · CPC title